If you do not see the Enable IPv6 networking option,
then your ZA may be corrupted and you may need to Reset it.

Follow the instructions below to See how to do it:

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To repair this problem, please follow the steps below. Please note that this will remove your program permission settings (so you may want to make note of them), but re-establishing them is a simple process.

1.) Hold down the Ctrl and Shift keys together 2.) Right click on the ZA icon near your clock in the system tray lower right corner3.) Choose 'Reset' from the box that comes up4.) Choose Yes on the Reset Settings dialog box5.) When prompted, choose OK to restart your system 6.) Follow the on screen configuration prompts after reboot